CN109359823B - BSC curve-based power distribution network wiring mode comprehensive efficiency evaluation method - Google Patents

BSC curve-based power distribution network wiring mode comprehensive efficiency evaluation method Download PDF

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CN109359823B
CN109359823B CN201811111222.5A CN201811111222A CN109359823B CN 109359823 B CN109359823 B CN 109359823B CN 201811111222 A CN201811111222 A CN 201811111222A CN 109359823 B CN109359823 B CN 109359823B
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power supply
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CN109359823A (en
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肖峻
佘步鑫
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Tianjin University
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

Abstract

The invention discloses a BSC curve-based comprehensive efficiency evaluation method for a wiring mode of a power distribution network, which comprises the following steps of: acquiring network structure parameters and load grade parameters, and further acquiring load grade weight vectors of each wiring mode of the network; acquiring a BSC curve or a BSC sequencing curve distributed according to loads, and further acquiring boundary power supply capacity parameters, average power supply capacity parameters and average power supply capacity reduction parameters in the BSC curve; obtaining the average load rate of a single wiring mode through the average power supply capacity parameter and the feeder line capacity; acquiring the load distribution adaptability of a single wiring mode through the average power supply capacity reduction parameter and the maximum power supply capacity parameter; acquiring comprehensive average load rate and load distribution adaptability rate of various connections through load grade weight vectors; drawing a comprehensive efficiency coordinate system by taking the load distribution adaptability as a horizontal axis and the average load rate as a vertical axis, and marking out efficiency points; and analyzing the results of the BSC curve and the comprehensive efficiency coordinate system to complete comprehensive efficiency evaluation.

Description

BSC curve-based power distribution network wiring mode comprehensive efficiency evaluation method
Technical Field
The invention relates to the field of planning and evaluation of a power distribution network, in particular to a comprehensive efficiency evaluation method of a power distribution network connection mode based on a Boundary power Supply Capability (BSC) curve.
Background
The wiring mode is a basic unit forming a power distribution network structure and is a primary object for researching the power distribution network structure. The selection of a scientific and reasonable wiring mode is a key step of power distribution network planning, and guarantees the improvement of the operation reliability and economy of the power distribution network.
The evaluation of the wiring pattern should be mainly made in terms of reliability and economy. In an urban power grid, with continuous transformation and upgrading for decades, a single radiation line is continuously reduced or even disappears. The reliability problem of the wiring mode is not obvious any more, people mainly pay attention to the economy, and the most direct embodiment of the economy is the efficiency, namely the upper limit of the allowable load rate.
The planning design guide rules specify the upper limit of the load rate of each wiring mode under the condition of meeting the N-1 safety criterion[1]. Reference [2]]The power supply capacity is used for evaluating the wiring mode, and the reliability and economic indexes are comprehensively considered; reference [3]A new planning and operation idea based on the maximum power supply capability (TSC) is provided, and the TSC is used for analyzing the wiring efficiency. However, TSC only reflects negativityThe theoretical maximum allowable load and load rate for an ideal distribution of load.
In summary, the conventional efficiency evaluation methods are not fine enough, for example: two-for-one backup connection and two-segment two-connection are considered to have exactly the same efficiency. In fact, the efficiency of the two is different.
Disclosure of Invention
The invention provides a curve based on BSC[4]According to the comprehensive efficiency evaluation method for the wiring mode of the power distribution network, the load grade weight vector of each wiring mode of the network can be obtained for a given wiring mode of the power distribution network according to the load grade parameters; then, BSC points which completely reflect the power supply capacity of the safety boundary can be obtained by sampling, and a BSC curve or a BSC sequencing curve distributed according to the load is drawn; then, calculating BSC indexes and efficiency indexes, and visualizing index results; and finally, marking efficiency points in the comprehensive efficiency coordinate system, analyzing the BSC curve and the comprehensive efficiency coordinate system result, and completing comprehensive efficiency evaluation, which is described in detail in the following description:
a power distribution network connection mode comprehensive efficiency evaluation method based on a BSC curve comprises the following steps:
acquiring network structure parameters and load grade parameters, and further acquiring load grade weight vectors of each wiring mode of the network;
obtaining a BSC curve or a BSC sequencing curve distributed according to loads, and further obtaining a maximum power supply capacity parameter, an average power supply capacity parameter and an average power supply capacity reduction parameter in the BSC curve;
for a single connection, obtaining an average load rate through an average power supply capacity parameter and a feeder line capacity;
for a single connection, acquiring a load distribution adaptive rate through an average power supply capacity reduction parameter and a maximum power supply capacity parameter;
for the combination of a plurality of connections, the average load rate and the load distribution adaptability rate of the plurality of connections are obtained through the load level weight vector;
drawing a comprehensive efficiency coordinate system by taking the load distribution adaptability as a horizontal axis and the average load rate as a vertical axis, and marking out efficiency points; and analyzing the results of the BSC curve and the comprehensive efficiency coordinate system to complete comprehensive efficiency evaluation.
The obtaining of the load level weight vector I of each wiring mode of the network specifically includes:
I0＝[P1，P2，……，Pi……PN]
Figure BDA0001809166860000021
in the formula PiAnd the load grade value of the power supply area corresponds to the ith wiring mode.
For a single connection, the average load rate obtained by the average power supply capacity parameter and the feeder line capacity is specifically as follows:
Figure BDA0001809166860000022
in the formula, S represents the capacity of the feeder,
Figure BDA0001809166860000023
and i is the number of the ith feeder.
For a single connection, the acquiring of the load distribution adaptability through the average power supply capacity reduction parameter and the maximum power supply capacity parameter specifically comprises the following steps:
Figure BDA0001809166860000024
where TSC is the maximum power capability parameter,
Figure BDA0001809166860000025
an average supply capacity degradation parameter.
For the combination of multiple connections, the specific steps of obtaining the average load rate and the load distribution adaptability rate of the multiple connections through the load level weight vector are as follows:
Figure BDA0001809166860000026
Figure BDA0001809166860000027
in the formula (I), the compound is shown in the specification,
Figure BDA0001809166860000028
represents the average load factor of the ith wiring pattern, Ad-iIndicating the load distribution adaptation rate of the ith wiring pattern, Ii]Representing the ith element value of vector I.
The method further comprises the following steps:
each distribution network, whether formed by a single wiring mode or a combination of a plurality of wiring modes, corresponds to an efficiency point
Figure BDA0001809166860000029
Efficiency point E of single-contact wiring power distribution networkSingle contact＝(100％，50％)。
The technical scheme provided by the invention has the beneficial effects that:
1. the invention defines load grade weight vector, efficiency index, comprehensive efficiency coordinate system and efficiency point, and then analyzes and evaluates the comprehensive efficiency of the wiring mode through BSC curve and the comprehensive efficiency coordinate system;
2. the method can simultaneously give consideration to the capacity utilization efficiency of the wiring mode and the adaptability to load distribution, has more complete and fine consideration factors compared with the existing method, and has higher discrimination, for example, the method can discriminate the subtle difference of the efficiency between the main and standby wiring and the sectional contact.
3. The method can evaluate the comprehensive efficiency of a single wiring mode and can also evaluate the comprehensive efficiency of a plurality of wiring modes after being grouped, and the application range is wide.
Drawings
FIG. 1 is a flow chart of a comprehensive efficiency evaluation method of a connection mode of a power distribution network based on a BSC curve;
FIG. 2 is a schematic view of a combined efficiency coordinate system;
FIG. 3 is a schematic view of an exemplary structure;
wherein, (a) is a single-linkage example; (b) two examples are provided for one; (c) two connection examples of two symmetrical sections; (d) two contact examples for two asymmetric segments; (e) two examples of flexibility are provided.
FIG. 4 is a BSC graph of load distribution;
wherein, (a) is a BSC curve with N for a preparation wiring example; (b) BSC curves for the symmetric segmented contact wire calculation example; (c) BSC curve of the asymmetric segment contact wiring example; (d) BSC curves for the flexible wiring example.
FIG. 5 is a graph of the visualization of an index;
wherein, (a) is BSC index result of single contact and two-circuit feeder calculation example; (b) the BSC index result of the three feedback line calculation example, and (c) the efficiency index result.
FIG. 6 is a graph showing the evaluation results of the comprehensive efficiency;
FIG. 7 is a graphical illustration of the overall efficiency distribution for a typical wiring pattern.
Fig. 8 is a schematic diagram of a network topology of an example before optimization.
Fig. 9 is a schematic diagram of a network topology of an optimized example.
FIG. 10 is a graph of the results of the comprehensive efficiency evaluation of the pre-and post-optimization examples.
Fig. 11 is a BSC ranking curve of an optimization pre-and post-calculation example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below.
Recent studies have shown that the power supply capacity of the distribution network is not only a maximum value (TSC), but a curve, i.e. a power supply capacity BSC curve, which is formed along the safety boundary. The embodiment of the invention provides a comprehensive efficiency evaluation method of a power distribution network connection mode based on a BSC curve, which can evaluate the comprehensive efficiency of the power distribution network connection mode more comprehensively.
Example 1
A comprehensive efficiency evaluation method of a connection mode of a power distribution network based on a BSC curve is disclosed, and referring to fig. 1, the method comprises the following steps:
101: acquiring network structure parameters and load grade parameters, and further acquiring load grade weight vectors of each wiring mode of the network;
102: obtaining a BSC curve or a BSC sequencing curve distributed according to loads, and further obtaining a maximum power supply capacity parameter, an average power supply capacity parameter and an average power supply capacity reduction parameter in the BSC curve;
103: for a single connection, obtaining an average load rate through an average power supply capacity parameter and a feeder line capacity;
104: for a single connection, acquiring a load distribution adaptive rate through an average power supply capacity reduction parameter and a maximum power supply capacity parameter;
105: for the combination of a plurality of connections, the average load rate and the load distribution adaptability rate of the plurality of connections are obtained through the load level weight vector;
106: drawing a comprehensive efficiency coordinate system by taking the load distribution adaptability as a horizontal axis and the average load rate as a vertical axis, and marking out efficiency points; and analyzing the results of the BSC curve and the comprehensive efficiency coordinate system to complete comprehensive efficiency evaluation.
In summary, in the embodiment of the present invention, the load level weight vector, the efficiency index, the comprehensive efficiency coordinate system and the efficiency point are defined through the steps 101 to 106, the comprehensive efficiency of the power distribution network connection mode can be more comprehensively evaluated through analysis by the BSC curve and the comprehensive efficiency coordinate system, and the comprehensive efficiency of a single connection mode and the comprehensive efficiency after various connection mode groups can be evaluated, thereby meeting various needs in practical application.
Example 2
The scheme of example 1 is further described below in conjunction with fig. 1-3, and is described in detail below:
first, net rack analysis
For a given distribution network, the wiring patterns adopted by the distribution network can be identified through the topological structure, and a set M consisting of the wiring patterns is formed:
M＝{mode1；mode2；……；modei；……modeN} (1)
wherein, modeiIndicating the i-th wiring pattern.
In practice, a simple power distribution network is often formed in a single wiring mode in an area with low requirements on power supply flexibility, and at the moment, only one element is in M; areas with high requirements on power supply flexibility often adopt multiple wiring modes to form a complex power distribution network, and at the moment, M contains multiple elements.
When M contains a plurality of elements, each element can be endowed with a weight according to the load level of the main power supply area of each wiring mode, and a weight vector I is generated, so that the importance degree of each wiring in the whole network can be quantized. The vector I and the elements in the set M are in one-to-one correspondence, and the method for generating I is as follows:
first, an initial load level vector I is generated0:
I0＝[P1，P2，……，Pi……PN] (2)
Wherein, PiRepresents a modeiLoad class value of the power supply area.
According to the national standard, the power load can be divided into the following parts from high to low according to the importance: primary load, secondary load, and tertiary load. When modeiWhen the power supply region corresponding to the wiring mode is mainly provided with a primary load, the corresponding Pi3, recording; when the secondary load is mainly used, corresponding P i2, recording; when three-level load is mainly used, corresponding PiNote 1.
Then, for I0And (3) carrying out normalization processing to obtain a weight vector I:
Figure BDA0001809166860000051
second, BSC Curve plotting
A distribution network security Domain (DSSR) assigns a set of all operating points in the power grid that meet N-1 security criteria, and BSC is defined as the sum of the loads of the operating points on the DSSR security boundary:
Figure BDA0001809166860000052
the operating point (BSC point) corresponding to the BSC has critical security, and any load increase will certainly cause N-1 not to pass through. There are infinite BSC points on the DSSR security boundary, and the sampling method can sample the BSC points which can completely reflect the power supply capability of the security boundary. Then, taking the load of a certain observation feeder line as an abscissa and the BSC value as an ordinate, and drawing a BSC curve distributed according to the load; and the BSC sequence curve can be drawn and formed by taking the sampling point number as the abscissa and taking the BSC value sequenced from small to large as the ordinate.
Different BSC curves have different application scenes, the relation between load distribution and BSC values can be visually seen according to the BSC curves of the load distribution, and the method is suitable for a simple power distribution network with a single wiring mode as an object; the BSC sequencing curve can integrally reflect the rising (falling) trend of the BSC value, and is suitable for a hybrid distribution network with multiple wiring modes.
(2) Index calculation
1) BSC index
The BSC index can help to mine the power supply capacity information contained in the power distribution network, reflects the efficiency level which can be reached by the network to the maximum extent, and has important reference value for the evaluation of the connection mode. The BSC indices are shown in table 1.
TABLE 1 BSC index family
Figure BDA0001809166860000061
2) Efficiency index
2 comprehensive efficiency evaluation indexes are defined based on the BSC indexes. For a single wiring mode distribution network, two indexes can be directly calculated:
(1) defining average load rate
Figure BDA0001809166860000062
Method for quantifying feeder capacity of distribution network with certain wiring modeThe efficiency is calculated by the formula:
Figure BDA0001809166860000063
in the formula, S represents a feeder capacity.
E.g. single connection wiring
Figure BDA0001809166860000064
The capacity utilization efficiency is low. It should be noted that the load rate of the embodiment of the present invention refers to the maximum allowable load rate, not the load rate of the actual load.
(2) Defining a load distribution adaptation rate AdFor quantifying the Adaptability of the wiring mode to the load distribution (Adaptability), i.e. plotting the degree of BSC decrease when the load distribution changes, the less BSC decreases and the stronger Adaptability, AdThe larger. A. thed∈[0，1]The calculation formula is as follows:
Figure BDA0001809166860000065
for example, a single-tap BSC is not dropped, which
Figure BDA0001809166860000066
Ad100%, the adaptability to load distribution is strong.
For a power distribution network combined by multiple wiring modes, the average load rate and the load distribution adaptive rate of each wiring mode need to be calculated firstly, then the weighted average value is respectively calculated for two indexes of each wiring mode according to the weight vector I, and the average load rate and the load distribution adaptive rate of the multiple wiring modes can be obtained, wherein the formula is as follows:
Figure BDA0001809166860000067
Figure BDA0001809166860000068
in the formula
Figure BDA0001809166860000071
Represents the average load factor of the ith wiring pattern, Ad-iIndicating the load distribution adaptation rate of the ith wiring pattern, Ii]Representing the ith element value of vector I.
Third, evaluation of comprehensive efficiency
The comprehensive efficiency coordinate system refers to a two-dimensional coordinate system formed by taking the load distribution adaptability as a horizontal axis and taking the average load rate as a vertical axis, as shown in fig. 2.
In the comprehensive efficiency coordinate system, whether the distribution network is composed of a single wiring mode or a plurality of wiring modes corresponds to one efficiency point
Figure BDA0001809166860000072
Efficiency point E of single-contact wiring power distribution networkSingle contactAs (100%, 50%), is indicated in fig. 2.
Drawing a comprehensive efficiency coordinate system according to the index result of the step 2, and marking out efficiency points; and analyzing the BSC curve and the comprehensive efficiency coordinate system result to finish comprehensive efficiency evaluation.
In summary, the embodiment of the invention analyzes the comprehensive efficiency of the distribution network connection mode through the BSC curve and the comprehensive efficiency coordinate system, can evaluate not only the comprehensive efficiency of a single connection mode, but also the comprehensive efficiency after various connection mode groups, and meets various requirements in practical application.
Example 3
The schemes of examples 1 and 2 are further described below with reference to specific examples, which are described in detail below:
a simple distribution network consisting of a single wiring mode is selected to introduce the scheme.
1. Basic cases of arithmetic
A typical single-contact, N-supply-standby (main-standby connection), sectional contact and flexible connection 4-type power distribution network connection mode construction example in China is adopted, and the construction example is shown in a figure 4. The feeder line capacities S are all 1MVA, wherein the subsection connection is further divided into a symmetrical example and an asymmetrical example, and the capacities of the distribution transformers hung on the feeder line sections are all 0.5 MVA.
2. The implementation procedure of the invention
Since the calculation examples are composed of single wiring patterns, the weight matrix I of all calculation examples is [1 ].
1) BSC Curve plotting
BSC points that can comprehensively reflect the power supply capacity of the calculation example are sampled and are shown in tables 2 to 6.
(1) Single contact example
TABLE 2 BSC Point of Single contact Algorithm
Figure BDA0001809166860000073
Figure BDA0001809166860000081
(2) Two-in-one alternative
TABLE 3 BSC Point for two supply-one examples
Figure BDA0001809166860000082
(3) Two section two connection example
TABLE 4 BSC Point of symmetric two-segment two-contact example
Figure BDA0001809166860000083
(4) Asymmetric two-segment two-contact example
TABLE 5 BSC Point of asymmetric two-segment two-contact example
Figure BDA0001809166860000084
(5) Flexible two-supply-one embodiment
TABLE 6 BSC Point for the Flexible two-for-one alternative
Figure BDA0001809166860000091
The BSC curves according to the load distribution are then plotted, see fig. 4.
2) Index calculation
Calculating the BSC index and the efficiency index, see table 7; the results of table 7 were visualized to form fig. 5.
TABLE 7 BSC index and efficiency index results
Figure BDA0001809166860000092
3) Evaluation of comprehensive efficiency
Efficiency points for each example are plotted in the integrated efficiency coordinate system, see fig. 6.
(1) BSC Curve analysis
As can be seen from fig. 4, the flexible connections and the single connections are horizontal straight lines, but one high and one low should be read as follows: the single-contact BSC is always equal to the lower limit BSCminThe flexible wiring is constantly equal to the upper limit TSC, and other wirings are arranged between the flexible wiring and the upper limit TSC; observation of BSC drop: the BSC of asymmetric segment contact drops most seriously, and the master-slave connection is in the middle, and the symmetric segment contact is minimum.
(2) Comprehensive efficiency coordinate system result analysis
The results of FIG. 6 were further processed to obtain a graphical representation of the overall efficiency distribution for each of the examples, see FIG. 7.
From fig. 6 and 7, the ranking results from low to high overall efficiency are shown: asymmetrical segment contact < N for one device < symmetrical segment contact < flexible wiring.
Example 4
The schemes of examples 1 and 2 are further described below with reference to specific examples, which are described in detail below:
and selecting a hybrid power distribution network combined by a plurality of wiring modes to introduce the scheme.
1. Basic cases of arithmetic
An IEEE-RTBS-BUS4 expansion example and an optimization transformation example thereof are selected, the capacity of a feeder line is 10MVA, and the capacity of a main transformer is 20 MVA.
The optimization prophetic example consists of 1 group of asymmetrical two-section two-connection, 1 group of two-supply one-standby and 1 group of single-connection wiring, and referring to fig. 8, the main power supply loads in the area are a primary load, a secondary load and a tertiary load in sequence.
The optimized example consists of a group of symmetrical two-section two-connection, 1 group of flexible two-supply one-standby and 1 group of single-connection wiring, and referring to fig. 9, the main power supply load of the area is consistent with that before optimization.
2. The implementation procedure of the invention
1) The weight matrix of the network before and after optimization is the same and is: i is0＝[3，2，1]，I＝[1/2，1/3，1/6]。
2) BSC Curve plotting
The BSC points that fully reflect the power supply capability of the examples were sampled and are shown in tables 8 and 9.
TABLE 8 BSC Point of optimization prophetic example
Figure BDA0001809166860000101
TABLE 9 BSC Point of optimized examples
Figure BDA0001809166860000102
Figure BDA0001809166860000111
The BSC ranking curve is then plotted, see fig. 10.
2) Index calculation
And sequentially and independently calculating the BSC index, the average load rate and the load distribution adaptive rate of each wiring mode, and then calculating the combined average load rate and the load distribution adaptive rate by combining the weight vectors, wherein the results are shown in a table 10.
TABLE 10 efficiency index results
Figure BDA0001809166860000112
3) Evaluation of comprehensive efficiency
Efficiency points of the pre-and post-optimization examples are marked in the integrated efficiency coordinate system, see fig. 11.
(1) BSC Curve analysis
It can be seen from fig. 10 that the BSC sorting curve of the optimization example is entirely higher than that of the optimization preceding example, and the curve is relatively gentle, and the BSCs are mostly distributed near the TSCs, so that the comprehensive efficiency of the wiring mode is higher.
(2) Comprehensive efficiency coordinate system result analysis
As shown in fig. 11, the optimized example adopts the symmetrical sectional connection and the flexible connection with higher efficiency, so that the comprehensive efficiency of the connection mode is higher, and the efficiency point is located at the upper right of the optimized example.
Reference documents:
[1] national grid company city power grid planning and design guide rule [ S ].2006.
[2] High voltage distribution network wiring mode analysis [ J ] based on power supply capacity calculation, electric network technology 2014, 38 (02): 405-411.
[3] New idea of intelligent power distribution network planning and operation based on maximum power supply capacity [ J ] power system automation, 2012, 36 (13): 8-14+31.
[4] The power supply capacity distribution of the intelligent power distribution network [ J ] power grid technology, 2017, 41 (10): 3326-3335.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the above-described embodiments of the present invention are merely provided for description and do not represent the merits of the embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A power distribution network connection mode comprehensive efficiency evaluation method based on a BSC curve is characterized by comprising the following steps:
acquiring network structure parameters and load grade parameters, and further acquiring load grade weight vectors of each wiring mode of the network;
obtaining a BSC curve or a BSC sequencing curve distributed according to loads, and further obtaining a maximum power supply capacity parameter, an average power supply capacity parameter and an average power supply capacity reduction parameter in the BSC curve;
for a single connection, obtaining an average load rate through an average power supply capacity parameter and a feeder line capacity;
for a single connection, acquiring a load distribution adaptive rate through an average power supply capacity reduction parameter and a maximum power supply capacity parameter;
for the combination of a plurality of connections, the average load rate and the load distribution adaptability rate of the plurality of connections are obtained through the load level weight vector;
drawing a comprehensive efficiency coordinate system by taking the load distribution adaptability as a horizontal axis and the average load rate as a vertical axis, and marking out efficiency points; and analyzing the results of the BSC curve and the comprehensive efficiency coordinate system to complete comprehensive efficiency evaluation.
2. The method for evaluating the comprehensive efficiency of the connection modes of the power distribution network based on the BSC curve according to claim 1, wherein the obtaining of the load level weight vector I of each connection mode of the network specifically comprises:
I0＝[P1，P2，……，Pi……PN]
Figure FDA0003064216420000011
in the formula PiCorrespondingly supplying power for the ith wiring modeLoad level values of the zones.
3. The method for evaluating the comprehensive efficiency of the connection mode of the power distribution network based on the BSC curve according to claim 1, wherein the obtaining of the average load rate through the average power supply capability parameter and the feeder line capacity for a single connection specifically comprises:
Figure FDA0003064216420000012
in the formula (I), the compound is shown in the specification,
Figure FDA0003064216420000013
and the average power supply capacity parameter is represented, S represents the capacity of the feeder line, and i is the number of the ith return feeder line.
4. The method for evaluating the comprehensive efficiency of the connection mode of the power distribution network based on the BSC curve according to claim 2, wherein the obtaining of the load distribution adaptation rate through the average power supply capability reduction parameter and the maximum power supply capability parameter for a single connection is specifically as follows:
Figure FDA0003064216420000014
where TSC is the maximum power capability parameter,
Figure FDA0003064216420000015
an average supply capacity degradation parameter.
5. The method for evaluating the comprehensive efficiency of the connection mode of the power distribution network based on the BSC curve according to claim 2, wherein the step of obtaining the average load rate and the load distribution adaptive rate of the multiple connections through the load class weight vector for the combination of the multiple connections specifically comprises:
Figure FDA0003064216420000021
Figure FDA0003064216420000022
in the formula (I), the compound is shown in the specification,
Figure FDA0003064216420000023
represents the average load factor of the ith wiring pattern, Ad-iIndicating the load distribution adaptation rate of the ith wiring pattern, Ii]Representing the ith element value of vector I.
6. The method for evaluating the comprehensive efficiency of the connection mode of the power distribution network based on the BSC curve is characterized by further comprising the following steps of:
each distribution network, whether formed by a single wiring mode or formed by combining a plurality of wiring modes, corresponds to an efficiency point
Figure FDA0003064216420000024
Efficiency point E of single-contact wiring power distribution networkSingle contact＝(100％，50％)。
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* Cited by examiner, † Cited by third party
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105337275A (en) * 2015-10-26 2016-02-17 天津大学 Medium-voltage power distribution network power supply capacity evaluation method based on reliability of power distribution system
CN107330576A (en) * 2017-05-17 2017-11-07 天津大学 A kind of power distribution network efficiency rating method based on border power supply capacity

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Boundary supply capability for distribution systems: concept, indices and calculation;jun xiao等;《IET》;20171222;全文 *

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